[1] He introduced the concept of swept wings and, after emigrating in 1947 to the United States under Operation Paperclip, invented the shockwave-free supersonic Busemann biplane.

The next year he was given the position of aeronautical research scientist at the Max-Planck Institute where he joined the famed team led by Ludwig Prandtl, including Theodore von Kármán, Max Munk and Jakob Ackeret.

[2] Busemann discovered the benefits of the swept wing for aircraft at high speeds, presenting a paper[3] on the topic at the Fifth Volta Conference in Rome on October 3, 1935, the very day of Italian invasion of Ethiopia which caused a delay of his talk.

At the time of his proposal, flight much beyond 300 miles per hour had not been achieved and it was considered an academic curiosity (in fact, Busemann was initially planning to present a talk on supersonic wind tunnels, but had to swap topics with Jakob Ackeret because of the "sensitive developments" for the Luftwaffe[4]).

[4] As director of the Braunschweig labs, he started an experimental wind tunnel test series of the concept, and by 1942 had amassed a considerable amount of useful technical data.

[7] He was awarded the Ludwig-Prandtl-Ring from the Deutsche Gesellschaft für Luft- und Raumfahrt (German Society for Aeronautics and Astronautics) for "outstanding contribution in the field of aerospace engineering" in 1966.